Rock-drill.



No. 887,363. PATENTED MAY 12, 1908. G D WARREN ROCK DRILL. APPLICATIONFILED JULY 16.1902. RENEWED OCT. 9, 1907.

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No. 887,363. 7 PATENTBD MAY 12, 1908.

G. D. WARREN.

ROCK DRILL.

APPLICATION FILED JULY 16. 1902. RENEWED OUT. 9, 1907.

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ROCK DRILL.

APPLICATION FILED JULY 16.1902. RENEWED 061. 9, 1907,

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UNITED sTArps PATENT OFFICE.

GOVERNOR D. WARREN, OF GRIPPLE CREEK, COLORADO.

ROCK-DRILL.

Application filed July 16, 1902, Serial No. 115,829.

To all whom it may concern:

Be it known that I, GOVERNOR D. WAR- REN, a citizen of the UnitedStates, residing at Cripple Creek, in the county of Teller and State ofColorado, have invented new and usefullmprovements in Rock-Drills, ofwhich the following is a specification.

My invention relates to improvements in rock drills. and pertainsparticularly to that class in which steam or compressed air is used asthe motive power.

The object of my invention is to provide a rock drill in which thepiston is partially rotated during the backward movement thereof, sothat the drill will strike in a different position on each forwardmovement of the piston in order that a round opening will be drilled.

Another object of my invention is to provide a drill adapted toaccomplish the above results, in which the piston is subject to aslittle strain as possible in causing the rotation thereof.

A still further object of my invention is to provide a drill in whichthere is both a central and end pressure which greatly increases thepower of the drill in comparison with the size of the cylinder.

In the accompanying drawings, Figure 1 is a longitudinal sectional viewof my improved rock drill. Fig. 2, is a transverse sectional view takenon line ec a; of Fig. 1. Fig. 3, is a rear end view. Fig. 4, is adetached enlarged view of the ratchet disk. Fig. 5, is an end view ofthe pawl carrying member. Fig. 6, is a horizontal sectional view of amodification partly broken away.

Referring now to the drawings, A represents a cylinder which iselongated in form and provided with an enlar ed central bore A, thepurpose of which will be hereinafter more fully described. Communicatingwith the upper portion of said enlarged central bore, is an oblongopening B adapted to receive the valve carrying block C, which isprovided with the transverse circular 0 ening (b having at one end anopening b by means of which it is connected with the steam or compressedair supply pipe and leading from opposite sides of said opening are thesteam supply ports c and 0 leading outwardly and communicating with thesteam conveying ports (l and d carried by the upper portion of thecylinder, and said ports lead to opposite ends ol the cylinder.

Extending transverse the valve carrying Specification of Letters Patent.

Patented May 12, 1908.

Renewed October 9, 1907. Serial No. 396,657.

block above and parallel with and communieating with the valve opening(L, is the exhaust opening D which is in communication with the outsideatmosphere on the opposite side from the steam supply pipe, and may haveconnected thereto a pipe 1) adapted to convey the exhaust to any desiredplace. T/Vithin said opening a is a valve E which is provided with acentral steam supply openmg e which extends clear through the valve, andcommunicating with the said opening are the transverse openings c and ewhich are adapted to register one at a time with the orts c and ccarried by the valve carrying lock. The said valve carrying block isprovided with an opening F in its lower face, and the valve E oppositesaid opening is provided with a downwardly extending operating arm Fwhich is ada ted to be reciprocated by the reciprocation o" the piston.The upper portion of the said valve between the ports 6 and c isprovided with a circular depression G which is adapted to communicatewith the exhaust opening D and one of the supply ports (1 when the steamis being admitted to the opposite end of the cylinder through theopening 0.

The forward end of the cylinder A is provided with the packing head 1which is made in two sections 2 and 3 and held together by the bolts 4,and said packing head is provided with the packing 5. Passing throughsaid head is the piston rod H which forms an air tight joint and theforward end of the piston rod carries the drill chuck which may be ofany form as this forms no part of my present invention. The inner end ofthe piston rod H carries a piston I which is of an elongated form, andis provided with a reduced central portion 1, the purpose of which willbe hereinafter more fully described. The said piston is made in twosections, t' and t" and the section at carried by the inner end of thepiston rod H is provided with a screwthreaded opening J. which isadapted to receive the screw-threaded end of the reduced portion. Eachof the said portions "L and i of the piston is provided with an annulargroove or recess 7c and 7c adapted to receive the packing K and K andthus making an airtight joint on each side of the reduced centralportion. Surrounding said reduced portion of the piston, are twolongitudinally movable rings L and L which are in the path of thedownwardly extending arm F of the valve E and adapted to move the saidarm thus first admits steam in one end of the cylinder and then theother.

Surrounding the central reduced portion of the piston between the tworings L and L is a coiled spring Z, the tendency of which is to forcethe rings apart.

I provide the end of the valve E opposite the inlet opening withanopening Zc which allows the steam or air to fill the entire enlargedcentral bore of the cylinder and thus I provide the drill with a-centralpressure which greatly increases the power of the drill, which I willnow proceed to describe.

The steam, as before stated, completely fills the enlarged central boreof the cylinder between the rings L and L and when the piston is in theposition shown in Fig. 1, the drill is near or at the end of thebackward stroke. The ring L fits snugly around the reduced portion ofthe piston, and is provided with a packing Z adjacent thereto and thusan air-tight connection is formed therewith. The steam entirely fillsthe enlarged bore between the rings and is therefore on both sides ofthe rings L and L, and thus during their movement forward and backwardthe pressure is equalized.

The forward ring L is provided adjacent the reduced portion of thepiston with transverse air or steam openings Z, and the steam pressuregained in said central portion is equal to that of the area of theshoulder formed by the reduced central portion of the piston. The ring Lis carried forward until it engages the wall formed by the enlargedcentral bore and is there seated and as the piston continues to travelforward, the steam is admitted through the opening Z and engages theshoulder of the piston and aids in carrying it forward, and the backwardpressure against said ring would be less than the forward pressure, asthe area thereof against which the steam is bearing is less at itsforward edge than at its rear edge and thus the washer is held seated.The washer would also aid in carrying the piston forward as shown inFig. 1, as the forward area of the washer exposed to the steam pressureis less than that of the rear side, thus the tendency of the steam is toforce the ring forward and at the same time the piston. The steampressure is at the same time keeping the rear washer L against theshoulder of the cylinder, and thus there is no resistance against theopposite end of the piston, until near the end of the stroke, when thepressure at the end of the piston and the momentum it has gained unseatsthe ring L and carries it forward, thus operating the valve and changingthe direction of the piston. By this construction, it will be clearlyseen that the central pressure is only utilized on the forward stroke ofthe piston or in other words,

on the drilling stroke of the drill. The washers L and L are sopositioned on the piston that when they are moved forward or backwardthey do not pass the steam inlet opening, but are directly opposite thesame and thus steam is not admitted ,directly behind either ring.

In the modification shown in Fig. 6, the cylinder is made the same borethroughout its length, and the piston is not provided with the rings 6and 7, and the downwardly extending valve operating arm is operateddirectly by the shoulder formed by the reduced central portion of thepiston in a manner similar to that of Fig. 1.

The rear end of the cylinder is provided with an enlarged opening 9,said opening eX- tending up adjacent the end of the supply opening d,and Within said opening is a circular fiat disk 10 which forms the rearend of the cylinder against which the backward pressure of the steam isresisted. Beyond the said disk is a ratchet disk 11, which is of lessdiameter than the disk 10 and is provided with a forwardly extendingmember 12 extending through the opening 13 in the disk 10, and providedwith spirally arranged grooves 14. The said member 12 passes within anopening 15 in the outer end of the piston and said opening 15 isprovided with inwardly projecting spirally arranged projections adaptedto enter the spiral grooves on the outer end of the member 12. As beforestated, the said ratchet disk is of a size less than the enlarged boreof the outer end, and surrounding said disk is a metal packing 16 whichis adapted to engage the outer periphery and frictionally prevent thesame from being turned too far during the forward stroke of the piston.The said metal packing 16 is provided with a peripheral groove 16 whichis in communication with an opening 16 in the cylinder, and whereby thesaid groove is filled with lubricating oil. The said peripheral groovehas communication with the inner ends of a number of openings 16 whichare adapted to feed oil to the ratchet disk. The said disk has its rearside provided with nine coarse ratchets 11, the purpose of which I willnow proceed to describe. l/Vithin said enlarged bore of the cylinderbeyond the ratchet disk 11, is an elongated cylindrical member 17, andsaid member is provided with four openings 18, which have their innerend reduced, and within said openings are four horizontal pawls 19adapted to engage the ratchets carried by the disk 11. The said pawlshave their inner ends reduced, and surrounding said reduced portions arecoil springs 20 which bear against the wall formed by the reducedportion of the pawl whereby they are normally outwardly spring pressedand held in contact with the ratchet disk 11. The pawl carrying memberis provided with a central recess 21 and the ratchet member is alsoprovided with a central opening 22, registering with the opening in thepawl member, and a pin has its opposite ends resting within the openingsin the ratchet disk and the pawl carrying member, whereby the ratchetdisk is prevented from twisting or being ground by the ratchet. Theinner end of the pawl block rests against the ring or packing 16, andbearing against the opposite end is a cylindrical block 25 which fitswithin the annular enlarged recess in the rear end of the cylinder, andthe outer periphery carries a packing ring 26 to form an air-tightconnection. Bearing against the rear end of said block and restingwithin a recess carried thereby, is a rubber block 27, and extendinghorizontally across said block is a leaf spring 28 which is drawninwardly by the bolts 29 and thus firmly clamp the pawl block 17 betweenthe circular disk 10 and the block 25, thus holding the same againstrotation. It is readily seen that this means of holding the pawl blockprovides a cushioned head which will give and allow the pawl block andthe ratchet disk to be forced rearwardly should there be any unduebackward pressure thereon, thus obviating the breaking of the ratchetteeth carried by the disk.

The lower edge of the cylinder adjacent the rear end is provided with adownwardly extending member 30 which has secured therein an elongatedhorizontal sleeve 30 which is provided with a screw-threaded opening 31through which passes the feed screw 32 which is of the ordinary formused in rock drills of this character. The forward end of saidhorizontal sleeve 30 is provided with an annular recess 33, which isadapted to receive the sleeve 34, which is adapted to cover the screw 32and to protect it from exposure to the atmosphere, and dust and dirt.The lower end i of the forward head of the piston is also provided witha downwardly extending member 35, which is provided with a recess 36,adapted to receive the outer end of the sleeve 34 whereby it is securelysupported.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is

1. A rock drill comprising a cylinder having an enlarged centralopening, a drill operating piston within the cylinder and having areduced central portion, means for admitting pressure at each end of thepiston and within the reduced central portion of the piston, and meanscarried by the reduced portion of the piston for exerting pressure onthe piston on its forward stroke.

2. A rock drill comprising a cylinder having an enlarged centralopening, a drill oper ating piston within said cylinder and having areduced central ortion, two rings loosely mounted upon said reducedportion of the piston, and means for admitting steam between said rings,whereby one bears against the piston and the opposite one against thecylinder, substantially as described.

3. A rock drill comprising a cylinder having an enlarged centralopening, a drill operating piston within said cylinder and having areduced central portion, two rings loosely mounted in said reducedportion of the piston, a spring normally forcing the rings apart, andmeans for admitting steam between said rings, substantially asdescribed.

4. A rock drill comprising a cylinder hav ing an enlarged centralopening, a valve above said opening, a valve arm extending within saidcylinder, a drill operating piston within the cylinder and having areduced central portion and a ring carried by said reduced portion ofthe piston on each side of the valve arm, substantially as described.

5. A rock drill comprising a cylinder hav ing an enlarged centralopening, a valve above said opening, a valve arm extending within thecylinder, a drill operating piston within the cylinder and having areduced central portion, a ring carried by the reduced portion of thepiston on each side of the valve arm and a coil spring between saidrings, substantially as described.

6. A rock drill, comprising a cylinder having an enlarged centralopening, a valve above said opening, a valve arm extending within thecylinder, a drill operating piston within the cylinder and having areduced central portion, a ring carried by the reduced portion of thepiston on each side of the valve arm, and means carried by the valve foradmitting pressure between the rings.

7. A rock drill, comprising a cylinder having an enlarged centralopening, a valve above said opening, a valve arm extending within thecylinder, a drill operating piston within the cylinder and having areduced central portion, a ring carried by the reduced portion of thepiston on each side of the valve arm, a coil spring between said rings,and means operated by the valve for admitting pressure between therings.

8. A rock drill comprising a cylinder hav ing an enlarged centralopening, a drill operating piston within said cylinder and having areduced central portion, and means for utilizing the steam in saidcentral and end openings siimiltaneously on its forward stroke.

9. A rock drill comprising a cylinder, a drill operating piston therein,and means for applying a central and end pressure simultaneously on theforward stroke.

10. A rock drill comprising a cylinder having an enlarged centralopening, a valve above said opening, a valve arm extending within thecylinder, a drill-operating piston within the cylinder and having areduced central portion, a ring carried by the reduced portion of thepiston on each side of the valve arm, and a coil-spring between saidrings.

1 1. A rock-drill comprising a cylinder having an enlarged centralopening, a valve above said opening, a valve arm extending within thecylinder, a drill operating piston within the cylinder and having areduced central portion, a ring carried by the reduced portion of thepiston on each side of the valve arm, and means between said rings forholding the same apart.

12. A rock drill comprising a cylinder having an enlarged centralopening, a valve above said opening, a valve arm extending within thecylinder, a drill operating piston within the cylinder and having areduced central portion, a ring carried by the reduced portion of thepiston on each side of the valve arm, and said valve arm having apassageway, whereby the fluid pressure is admitted between the rings.

13. A rock drill comprising a cylinder having an enlarged centralopening, a valve above said opening, a valve arm extending within thecylinder, a drill-operating piston within the cylinder and having areduced central portion, a ring carried by the reduced portion of thepiston on each side of the valve arm, a coil-spring between said rings,and said valve arm having a passageway whereby fluid pressure isadmitted between the rings.

14. rock drill comprising a cylinder having an enlarged central opening,a valve above said opening, a valve arm extending within the cylinder, adrill-operating piston within the cylinder and having a reduced centralportion, a ring loosely mounted upon the reduced portion of the pistonon each side of the valve arm, means for admitting fluid pressurebetween the rings.

15. A rock drill comprising a cylinder having an enlarged centralopening, a drill-operating piston within the cylinder and having areduced central portion, and means for utilizing the fluid pressure insaid central and end openings simultaneously on the forward stroke.

16. A rock drill comprising a cylinder having an enlarged centralopening, a drill-operating piston within the said cylinder and having areduced central portion, a ring mounted on said reduced portion, andmeans whereby a central and end fluid pressure 1s simultaneouslyobtained on the forward stroke of said piston.

17. A rock drill, comprising a cylinder, a drill operating piston withinsaid cylinder and having a reduced central portion, means for admittingsteam at each end of the piston and within the central reduced portionof the piston, and means carried by the reduced portion of the pistonfor exerting steam pressure on the piston on its forward stroke.

18. A rock drill, comprising a cylinder having an enlarged centralopening, a valve above said opening, a valve arm extending within saidenlarged opening, a piston within the cylinder and having a reducedcentral portion, rings carried by said reduced portion on the piston ofeach side of said valve arm.

19. A rock drill, comprising a cylinder, having an enlarged centralopening, a valve arm extending within said opening, a piston within saidcylinder and having a reduced central portion, rings carried by saidreduced portion of the piston, and a spring normally holding said ringsapart.

20. A rock drill, comprising a cylinder having an enlarged centralopening, a valve arm extending within said opening, a piston within thecylinder and having a reduced central portion, rings loosely mountedupon said reduced portion of the piston on each side of said valve arm,and extending within the enlarged opening in the cylinder, a coil springbetween said rings and one of said rings having steam passagestherethrough and adapted to be closed by the shoulder formed by thereduced portion of the cylinder.

21. A rock drill, comprising a cylinder having an enlarged centralopening, a valve above said opening, a drill operating piston within thecylinder and having a reduced central portion, means operated by thevalve for admitting pressure into the end and enlarged central portionof the said cylinder, and means carried by the reduced portion of thepiston for exerting pressure on the piston on its forward stroke.

22. A rock drill, comprising a cylinder hav ing an enlarged centralopening therein, a piston within the cylinder and having a re ducedcentral portion, a valve above the enlarged portion of the cylinder, andadapted to allow pressure to enter at the end and central portion ofthe. piston, a valve arm carried by the valve and adapted to enter saidenlarged and reduced portion of the cylinder and piston, a ring carriedby the reduced por tion of the piston on each side of the valve armentering the enlarged opening in the cylinder, a coil spring betweensaid rings, one of said rings having steam passages through the same andadapted to be closed by the shoulder formed by the reducing of thepiston.

23. A rock drill comprising a cylinder, a valve above said piston, avalve arm carried by the valve and extending into the cylinder adjacentthe piston and rings loosely mountabove said opening, a valve armextending Within said enlarged opening, a piston within the cylinder andhaving a reduced central portion, and rings loosely mounted upon saidreduced portion of the piston on each side of said valve arm.-

26. A rock drill comprising a cylinder having an enlarged centralopening, a valve above said opening, a valve arm extending Within saidenlarged opening Within the cylinder and said valve arm having a steampassage way therethrough, and rings loosely mounted upon the reducedportion of the piston on each side of said valve arm.

27. A rock drill, comprising a cylinder l1aving an enlarged centralopening, a valve above said opening, a valve arm extending Within saidenlarged opening, a piston within the cylinder, said valve arm having asteam passage-way therethrough, rings loosely mounted upon the reducedportion of the pisl ton on each side of said valve, the forward GOVERNORD. WARREN.

WVitnesses:

O. K. WIIITING, NEIL J. MCGEE.

